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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0637b74cdecdc6767377b90096d6cfe332fa219404a2bf28e0b1083bbd5094c' 
  AND token = '9hd59qapX62PzeWSENlbUqAKNJ4WOG6ZYzCr/Hf7TXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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