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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82e8dc9ad6b00d7601ad614a00c6033fde3edb628c1690e859a867f5377057e' 
  AND token = 'tvzjHrIONW27jwloTGKotsWD/SWbsn9PS+N8f1fJq8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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