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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9480cf54a825b5d2b4c065e6ccad3e773f636b7ad846baab106c30c2bf6bece5' 
  AND token = 'GWb+WQhOmrTzD8+8ZxteIGtte+CaCUa9l/kMeO/omZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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