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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce298db6060c616162e07f64a46b0f481f1ca705cf7101c69597209529e475e' 
  AND token = 'YaT2R5Cx87Q70qJMNT9SJsIgBVBnL0W8Uaf+AdzviyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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