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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309e147488793a4527b80ba4d99921870663bd3614cdeb993cfc8d6bc46dfeca' 
  AND token = '/Ag/G9e+AK+E29SwfwW4c7pYLewRtnhg8kzmWovYdCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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