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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd044d6177bd63e7ec4f6def74389693dec237437a8ce2b224c16b82db9b9772c' 
  AND token = 'aCZg0MO9yXXxObDZQCm+kNb7BBAwg1S7xdoDTqkzZ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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