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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a1113a1374a48289ee93f60b5c2a4fa7e623299d9dd4cdcbd3a72ad5b1a480' 
  AND token = 't8NHMwa4raUAI+QIQ4Kg03WRD/whRUWKJH1uw36ESPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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