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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f15df9e24ba293e809ab397d4577c41efca91ce03e0584664785b7ec70dcad' 
  AND token = 'uWaFWXFmPFeKS5f95NfYGP8xQ24iD4sJHgd4I3DX/3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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