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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae29fac19c9d5908cdd93e49a2c772cbcac6f4b1b041508a6a8a3ec1c223daf' 
  AND token = 'ypCtO9mNXCUmeylxIBGABI7D8EA3dsOlaAbSmCPQYaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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