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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c397ff17123fb07d188bf6d93df75e33dd17ae671f97771f0d9f317fd6951d7' 
  AND token = 'fiO4rYil8vRwfh4+L9s7hM2k08Rbw6d54J6Me9/DynQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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