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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f739ab6f861f7f5984a2ca04f0a5ebb55cf289fbbb33c7714a9d3f3b1bd24bdf' 
  AND token = 'vsEt0naTrY+JWryVc6Xm0J/jaAZ9pPD3oFal2urtb+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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