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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3cc100b22e8039717db713b1c748644304f6c79ea835071a78bb4a6146fcca' 
  AND token = 'hHk5qNb2lgM0+mcuxWSFUi7FCX0oaMcGZ10EApvioig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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