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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aafd80b8343c2fd73384fb70e8c3bc7d4437aabd479990d6a41260ef863a836' 
  AND token = '1+jl2Z9CSWDfPWCIVY9b+rD03kJAB68fM1HVHgs58IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}