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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eec9b8ab138061ff963db22dac4f76a3ce6706eeb1f9ea88a124b401656bd50' 
  AND token = 'OkYZUJrA+R/2Sw8ZtT0ld+Ol8i57/oKbrA9cfFMxzOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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