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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397e3ddf8b5d1dcb726a67a497d98712eb48c1d00a0cdac249e4a81f245d359a' 
  AND token = 'BUVeW5H0yOIR3K8IqPVWfGBj8WjJHRzicdkIqBo9MHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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