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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b0550e988f3e7f8b65629529c9d9d2c36769b777058d1baf4fac88e51e9d6a' 
  AND token = '2XldEHLiJm1OMW+3OO/fHo3Bt+7iJeC6f3R84xG/MX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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