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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13df97e1cb792bab7eb282b93d4f776a03de5993dffd4c18db255decb6fdaa36' 
  AND token = '3YkGxK5X1Z2DR1WETVg/8AaWigCESXAecO2u0BCDvKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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