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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13bda239827cee5c870a8953bac40bff0b2cc06ed047143cdd5f53b85168596' 
  AND token = '14GwvWwz5bhDrGIgDnATxv3g03p5PQ9ism7Z47WdI/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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