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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba04abdc7a8e822ede594129367932c828f295bd4e160a5bf194c98f8c0e6e1' 
  AND token = 'AdY65lmELcvQi2XoHWc03svZDaDhMJ0jPQdZNpVdqvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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