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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c49a8168e2ef29777b478d75b54c891777c8abb6cacda0887d8bfd80569a7d' 
  AND token = 'eMEo5eLyzUfX2gbTNNa6xcEOUxQgdzgwux1UhgQle6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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