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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ace6a64d449d7d516815f000883884468c7af5650164b4c4d97ec61a316ade' 
  AND token = 'BQ0F1yQ49tpGcrS6Pe2Vj2Rl46921pj3OsFu0ROtgBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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