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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f9704596bc401d0b1eca9e069dd939107be513949f6008e70da99f549c68c4' 
  AND token = 'a6uxyT8qMTTeCcrRIVYg1A5BJ87R6j60RdZbFaprXGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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