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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0103c29a7c77e7fc8687b990e072e5c07d042ed6774452419d56ed1f3601b9' 
  AND token = 'BDToBrUq1Xcqpyl8ZZInpxms0q9+swYgXtLMh4ks8to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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