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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd12d41844ab8b7c74f7715e93fa1fd639b6257f8834f37f0b5014db89309a0b' 
  AND token = 'pInq/8HANK6mDWQXDXq3F45J7Bc12T3SSsSsUdYuWNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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