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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fe76946ae0a7a06aa26b7072f3f4b2b5e6bf09935c334e51c4cd0d9bc17e44' 
  AND token = 'VoNN1K+CfnNiuxKK+mWBYyi0f42s2npwvI6YSMyiNyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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