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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937a16c43b30568ace8c58e325e817a7d365c63107c31fb3f88cc76e2ab01b55' 
  AND token = 'Ml2VnOXXrqwDSSE61ABNcAyWMoqhZzZrjcfkwI6xilw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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