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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dac42ef2fb4412f7a5f50da22affa9f2a96a8f960a22bf5bf9e21e7a770ed4b' 
  AND token = 'iCfJmoOsLEdPuwgAiKyCEcJEnFcydLNJPG27WrLEDvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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