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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b806891cba06e868b6792d6a7f7c0db8924a3b1007e7b235e24b0639b6db7d' 
  AND token = '+XaklPOwDf0FfIEoGtW07BRHksdjpUrceSRv9JZ54tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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