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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf8f7b6c9fde5529eb421e3446df032ef9e78122f8e7c3f8a4dbc3cee069397' 
  AND token = 'CagOQ6LUbXaQNhvyvqHz/cNFOSouIkS7I00o+SQjG58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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