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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d838a0df8834294e71e2ba88429d401aebe4f19d469adb5b59218bc6fc7bac' 
  AND token = '3bD05mhUfLSY86OsFxlZL9ZzW6pWTZA4QGsog338Bzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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