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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff01926d12c31466429c9e0fb1053607052e4e9111661d9b83a5d230ef99261' 
  AND token = 'hGlUwfowBzbSZk+m4r0Serrd44GRJ2nkiLW8Vso8f74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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