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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9362ce53193ac904cdcd472744c8bdcef57e68f69c9a7a13e178e383ea39be52' 
  AND token = '+Ohus99mHeGmJir3226NRjOt6vE+ymOsXTO3MkgEcus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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