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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f762725d91ed5980cc5264695a307a57dc0606ae67426a238c089628fa5eab9' 
  AND token = 'd3J9k6xYpju8QIbT4VfIUfXa89BlcnGaqBrhsb6lrlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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