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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf7516f03525b8e6ff422507fd1afc409aa321c3800e2c5c93f8f5d4f75584c' 
  AND token = 'Btd16ZL3oW2SvUoPs4BDNo4BjaVGq/eeMr1miimWVC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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