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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965ad1c86ccdf20808b48769f084dd53e305c4847eff0ff036c8a72abd9faec6' 
  AND token = 'SaWu9AF66aigTHYMswbk1cSyL7FUNKUihCMHgVesGqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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