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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be1f7d5af87588bc3b9be4b8b720dc8dee1ecfe4a006bb99ae1ea0da24f8611' 
  AND token = 'R6uROMIzhs44mUlg6+V2JjEuj1pT/dzBeRc1I1+zo8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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