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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe28cf6c62c17a5899a6e66f813602d904bb80e17c524299653aa3cb9b4b46f' 
  AND token = 'ubVflH12RqiuNOQbk/4pEw4bpYrjKcIYCgpES2dWLwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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