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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e31027a59860c0de459e47be3a8505494f16fa1877686aa2a8c9b05c246869' 
  AND token = 'ay4Ezu5EDQZj7pPShl69tTd4IU3MLo0XhGTyk16A4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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