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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc70f38c941a609bbae314fa53295d0663e1f61e190e35b1bae682c1780b33a2' 
  AND token = 'Tcz65ElhwHSbWpq+SqytTT5c321laCQ5HOFERMQ4WnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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