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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c87143ee4b0adf2e82376305e9a9bcd9921bb35a544bd69b850a365a1eb5bc' 
  AND token = 'a1G3Oyx4+CUZNl3SmsD7K+tjoN6Q2hvnbOWSUNVgXCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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