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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037c68e94ad0b4d315deaf87fe06cd017789bbc3046b7154d7d2ea5882ca6cee' 
  AND token = 'W4opw5kw1cagwyRDR0jCkCoVR/N2WFuOF6lw0qVPWAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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