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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50be1334a81673a7fd69bc9a51763307d3c5d6d887c3795b61722605189d61e' 
  AND token = 'n1PPQXB70+/Q7phON13kANrqMvr5UWze2ctN+2x2m0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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