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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e27ee29412aceaadcd0584dea7131553187246326dfd140f2f1e8882e9c1910' 
  AND token = 'gK2K6k2/ktE6Ky27va3Vi6PCYZ+kS2v4v/3A0w8l/qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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