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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca51e19e4ed67254ae4968a7f91010911c2be020c81615ec61bb5c98fec158b' 
  AND token = '4qYHmDzj5Vm/J32cEZsVzVhT5ZRZZ5L6YBRNP48kTT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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