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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b099ab3128e588be0c7b287787d1c03e24d82ded1b994ed913ca8d540974830' 
  AND token = 'Nh+sPYcEbFh+3EhP/QXMwF+OvSGC/w4DhDRV01+zveI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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