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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ce3f36849813990c91a13e63b1caf0721c8de2e63195726b468b0bcd6f9bf5' 
  AND token = 'g2iITnBJrPe5T8IJWxeIQb7hD0nNTsdsb/Cgy4NVkI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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