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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c287dc89e3b8b4f02bf66c36e8a7f9e477bf032fb998b1a1a4507dff542e4639' 
  AND token = 'jsnL44Kh6N9C49Ybukk+aRi3Rn59WosU2GSsIO67MsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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