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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9c1d274800d5f7c8cb77e8ef3cfa21f631775a9d12a45709d71b1de0862a6d' 
  AND token = '2/XfaFvB7uG6RUYNWT5fXVHg8T15/O58VOMEY4VBP3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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