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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e1d82ea78b50210d39a1b8a8bd5a723811d29241ffe786769cf67335e83759' 
  AND token = '7G5loR/MbM+2RZ/ggf4wq42VoC0wBm+Z0o46UfxrfEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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