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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713d4e6ae58954a0282f55ce30bf77b2118a5f79fcb1618828b4d17e02c6c167' 
  AND token = 'G50OgTnUaHPPJ5voqTA53GAB7al2p213q4iqSPqOG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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