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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79e930c6ad0a15553608248eef03f5972b05baee802c638170787ac9d0da146' 
  AND token = 'QfdXCD242mwAh8inkBqERtNJf58H0oGskQUdmM4z+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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