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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1339b0e348d4781cbe5ed84bcb84c0e40edebfa16455d819e729b505f105c9a6' 
  AND token = 'vI21KgoTHzidTNI+SIw0Girp0J7X2M6+6wjENSm0Z6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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