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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afad05309ea0fdb53964b2b162baeca77f49eb207b3fba891caf633db87daa1' 
  AND token = 'LSJsD5joQ1jy4gl+XmL3fXMl3J+Qxvh/4IZw/5Lo4wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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