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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae0d55364fee7e692478148a9c12554d1b38ca991196d5a2e105585333624fe' 
  AND token = 'urxLo3v0HQkqzoi4Ads/13HtOJsIgE8Aofw/KNu0I6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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