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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0209f78d9d7b49f82b789348f1f1a4d4afb9dd29008ca809a8904f430ca24207' 
  AND token = 'jOkVqGxJXChMHvTp93iHv+JFlSs9krveflNAHFxR/6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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