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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0196be69ea15006df6a01b21c26ed617bc840e5145cbad62db101121a27b43eb' 
  AND token = 'XVdTLFn5RbnGBfQJgLaYhtCA1sSPLu/Ifr9g4E7/t5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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