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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42773f6b28c31a1a7df6b62d1186733cce81ac8168198007de810284606c7214' 
  AND token = 'LWsXfzqagetCQJPkUPqt/zQy3HiGm/Ifn7pugevUjzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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